If Earth describes an orbit round the sun of double its present radius, the year on Earth will be of A) 365 days $\frac{365}{\sqrt{2}}$ (B) $365 \times 2 \times \sqrt{2}$ days (C) $\frac{2}{365}$ days (D) $365 \times 4$ days
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Step 1: Use Kepler's third law for planets orbiting the same star: the orbital period T satisfies T^2 ∝ a^3, so T ∝ a^(3/2). Show more…
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